–

–

–

–

22

23

103 – Update Rate Control

This command is used to control the output of standard NMEA messages

GGA, GLL, GSA, GSV, RMC and VTG. Using this command message,

standard NMEA messages may be polled once, or setup for periodic

output. Checksums may also be enabled or disabled depending on the

needs of the receiving program. NMEA message settings are saved in

battery-backed memory for each entry when the message is accepted.

Figure 23 contains the values for the following example:

1. Query the GGA message with checksum enabled

$PSRF103,00,01,00,01*25

2. Enable VTG message for a 1Hz constant output with checksum

enabled

$PSRF103,05,00,01,01*20

3. Disable VTG message

$PSRF103,05,00,00,01*21

4. Enable 5Hz mode

$PSRF103,0,6,0,0*23

5. Disable 5Hz mode

$PSRF103,0,7,0,0*22

Name

Example

Units

Description

Message ID

$PSRF103

PSRF103 protocol header

Msg

00

See Figure 24

Mode

01

0=SetRate, 1=Query, 6=Enable

00

seconds

Output: off=0, max=255

CksumEnable

01

0=Disable, 1=Enable Checksum

Checksum

*25

<CR> <LF>

End of message termination

1. Default setting is GGA, GLL, GSA, GSV, RMC and VTG NMEA messages are enabled

with checksum at a rate of 1 second.

2. Enabling the rate divider divides the rate value by 5.

3. Rate value sets the period of a single transmission. For maximum update rate (5Hz)

enter a value of 1 and enable the rate divider.

Figure 23: Update Rate Control Example

unused NMEA message types (see example 3) and set the serial port

to maximum baud rate (see Figure 20). The rate divider takes effect

only after a fix is established.

MSGValues

Value

Description

0

GGA

1

GLL

2

GSA

3

GSV

4

RMC

5

VTG

6

MSS (not supported)

7

Not defined

8

ZDA

9

Not defined

Figure 24: MSG Values